The Temperature Quiz
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Questions and Answers

Which of the following is NOT a way in which compensation can work in organisms?

  • Changing the abundance of an enzyme
  • Matching enzyme isoform expression to environmental conditions
  • Changing the temperature of the environment (correct)
  • Changing enzymes in a pathway

    • Which of the following statements about isozymes is TRUE?

  • Isozymes have the same kinetic parameters
  • Isozymes have the same amino acid sequence
  • Isozymes catalyze different chemical reactions
  • Isozymes allow fine-tuning of metabolism (correct)

    • In which organism does compensation occur by increasing the amount of enzyme to compensate for reduced efficiency at lower temperature?

  • Antarctic icefish (correct)
  • Butter
  • Rainbow Trout
  • Olive Oil

    • What happens to the affinity of acetylcholinesterase for acetylcholine in the Antarctic icefish?

    <p>Affinity decreases</p> Signup and view all the answers

    In the Rainbow Trout, at what temperature is there full compensation?

    <p>18°C</p> Signup and view all the answers

    What contributes to compensation in organisms through changes in an enzyme's microenvironment?

    <p>All of the above</p> Signup and view all the answers

    Which of the following changes in the phospholipid membrane increases fluidity?

    <p>Incorporating double bonds</p> Signup and view all the answers

    What does behavioural thermoregulation in lizards involve?

    <p>All of the above</p> Signup and view all the answers

    What does behavioural thermoregulation in drought-stressed corn involve?

    <p>Reducing sun interception</p> Signup and view all the answers

    Are ectotherms passive victims of their thermal environments?

    <p>No</p> Signup and view all the answers

    Which equation represents the relationship between metabolic rate (M), body temperature (Tb), and constants (a and n) for an ectotherm?

    <p>$M = a10^nTb$</p> Signup and view all the answers

    What is the intercept in the equation $logM = log(a) + nTb$?

    <p>$log(a)$</p> Signup and view all the answers

    What does Q10 represent in the equation $Q10 = \frac{RT}{R(T-10)}$?

    <p>The temperature coefficient</p> Signup and view all the answers

    Which statement about the temperature-metabolic rate relationship is true?

    <p>The relationship is not exactly exponential</p> Signup and view all the answers

    What is the function of enzymes in facilitating chemical reactions?

    <p>Enzymes bind substrates and facilitate chemical reactions</p> Signup and view all the answers

    What does Km represent in the reaction rate equation $Vmax = \frac{Vmax}{2} + Km$?

    <p>The amount of substrate required to reach 50% of Vmax</p> Signup and view all the answers

    How does enzyme-substrate affinity change with temperature?

    <p>Affinity can be too high or too low at extreme temperatures</p> Signup and view all the answers

    What is the term for a genetically controlled trait that confers a greater probability of survival and successful reproduction in a population?

    <p>Adaptation</p> Signup and view all the answers

    Which term describes a chronic response of an individual to a changed environment?

    <p>Acclimatization</p> Signup and view all the answers

    What is the measure of enzyme-substrate affinity used in the HCA method?

    <p>Enzyme-substrate affinity (≈1/Km)</p> Signup and view all the answers

    Which of the following best describes temperature?

    <p>A measure of the speed or intensity of the incessant random motions that all the atoms and molecules of any substance undergo on an atomic-molecular scale</p> Signup and view all the answers

    What determines the direction of heat transfer?

    <p>Temperature</p> Signup and view all the answers

    Which of the following best describes heat?

    <p>The amount of energy in an object</p> Signup and view all the answers

    What is the formula for latent heat of vaporisation of water?

    <p>$2270 kJ/kg$</p> Signup and view all the answers

    Which of the following best describes ectotherms?

    <p>Organisms that rely mostly on external temperatures to determine body temperature</p> Signup and view all the answers

    What is the term for having different body temperatures in different parts of the body?

    <p>Heterothermy</p> Signup and view all the answers

    Which of the following best describes endotherms?

    <p>Organisms that generate internal (metabolic) heat</p> Signup and view all the answers

    What is the term for organisms that allow their body temperature to vary?

    <p>Poikilotherms</p> Signup and view all the answers

    What is the term for organisms that keep their body temperature constant?

    <p>Homeotherms</p> Signup and view all the answers

    What is the term for organisms that have more than one temperature set point or switch between homeothermy and poikilothermy?

    <p>Heterotherms</p> Signup and view all the answers

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